mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 14:12:51 +00:00
fe93d841dd
This patch replaces the custom crypto completion function with crypto_req_done. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
204 lines
5.4 KiB
C
204 lines
5.4 KiB
C
/*
|
|
* ECDH helper functions - KPP wrappings
|
|
*
|
|
* Copyright (C) 2017 Intel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation;
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
|
|
* IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
|
|
* CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
|
|
* COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
|
|
* SOFTWARE IS DISCLAIMED.
|
|
*/
|
|
#include "ecdh_helper.h"
|
|
|
|
#include <linux/scatterlist.h>
|
|
#include <crypto/ecdh.h>
|
|
|
|
static inline void swap_digits(u64 *in, u64 *out, unsigned int ndigits)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ndigits; i++)
|
|
out[i] = __swab64(in[ndigits - 1 - i]);
|
|
}
|
|
|
|
/* compute_ecdh_secret() - function assumes that the private key was
|
|
* already set.
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp().
|
|
* @public_key: pair's ecc public key.
|
|
* secret: memory where the ecdh computed shared secret will be saved.
|
|
*
|
|
* Return: zero on success; error code in case of error.
|
|
*/
|
|
int compute_ecdh_secret(struct crypto_kpp *tfm, const u8 public_key[64],
|
|
u8 secret[32])
|
|
{
|
|
DECLARE_CRYPTO_WAIT(result);
|
|
struct kpp_request *req;
|
|
u8 *tmp;
|
|
struct scatterlist src, dst;
|
|
int err;
|
|
|
|
tmp = kmalloc(64, GFP_KERNEL);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
req = kpp_request_alloc(tfm, GFP_KERNEL);
|
|
if (!req) {
|
|
err = -ENOMEM;
|
|
goto free_tmp;
|
|
}
|
|
|
|
swap_digits((u64 *)public_key, (u64 *)tmp, 4); /* x */
|
|
swap_digits((u64 *)&public_key[32], (u64 *)&tmp[32], 4); /* y */
|
|
|
|
sg_init_one(&src, tmp, 64);
|
|
sg_init_one(&dst, secret, 32);
|
|
kpp_request_set_input(req, &src, 64);
|
|
kpp_request_set_output(req, &dst, 32);
|
|
kpp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
crypto_req_done, &result);
|
|
err = crypto_kpp_compute_shared_secret(req);
|
|
err = crypto_wait_req(err, &result);
|
|
if (err < 0) {
|
|
pr_err("alg: ecdh: compute shared secret failed. err %d\n",
|
|
err);
|
|
goto free_all;
|
|
}
|
|
|
|
swap_digits((u64 *)secret, (u64 *)tmp, 4);
|
|
memcpy(secret, tmp, 32);
|
|
|
|
free_all:
|
|
kpp_request_free(req);
|
|
free_tmp:
|
|
kfree_sensitive(tmp);
|
|
return err;
|
|
}
|
|
|
|
/* set_ecdh_privkey() - set or generate ecc private key.
|
|
*
|
|
* Function generates an ecc private key in the crypto subsystem when receiving
|
|
* a NULL private key or sets the received key when not NULL.
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp().
|
|
* @private_key: user's ecc private key. When not NULL, the key is expected
|
|
* in little endian format.
|
|
*
|
|
* Return: zero on success; error code in case of error.
|
|
*/
|
|
int set_ecdh_privkey(struct crypto_kpp *tfm, const u8 private_key[32])
|
|
{
|
|
u8 *buf, *tmp = NULL;
|
|
unsigned int buf_len;
|
|
int err;
|
|
struct ecdh p = {0};
|
|
|
|
if (private_key) {
|
|
tmp = kmalloc(32, GFP_KERNEL);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
swap_digits((u64 *)private_key, (u64 *)tmp, 4);
|
|
p.key = tmp;
|
|
p.key_size = 32;
|
|
}
|
|
|
|
buf_len = crypto_ecdh_key_len(&p);
|
|
buf = kmalloc(buf_len, GFP_KERNEL);
|
|
if (!buf) {
|
|
err = -ENOMEM;
|
|
goto free_tmp;
|
|
}
|
|
|
|
err = crypto_ecdh_encode_key(buf, buf_len, &p);
|
|
if (err)
|
|
goto free_all;
|
|
|
|
err = crypto_kpp_set_secret(tfm, buf, buf_len);
|
|
/* fall through */
|
|
free_all:
|
|
kfree_sensitive(buf);
|
|
free_tmp:
|
|
kfree_sensitive(tmp);
|
|
return err;
|
|
}
|
|
|
|
/* generate_ecdh_public_key() - function assumes that the private key was
|
|
* already set.
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp().
|
|
* @public_key: memory where the computed ecc public key will be saved.
|
|
*
|
|
* Return: zero on success; error code in case of error.
|
|
*/
|
|
int generate_ecdh_public_key(struct crypto_kpp *tfm, u8 public_key[64])
|
|
{
|
|
DECLARE_CRYPTO_WAIT(result);
|
|
struct kpp_request *req;
|
|
u8 *tmp;
|
|
struct scatterlist dst;
|
|
int err;
|
|
|
|
tmp = kmalloc(64, GFP_KERNEL);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
req = kpp_request_alloc(tfm, GFP_KERNEL);
|
|
if (!req) {
|
|
err = -ENOMEM;
|
|
goto free_tmp;
|
|
}
|
|
|
|
sg_init_one(&dst, tmp, 64);
|
|
kpp_request_set_input(req, NULL, 0);
|
|
kpp_request_set_output(req, &dst, 64);
|
|
kpp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
crypto_req_done, &result);
|
|
|
|
err = crypto_kpp_generate_public_key(req);
|
|
err = crypto_wait_req(err, &result);
|
|
if (err < 0)
|
|
goto free_all;
|
|
|
|
/* The public key is handed back in little endian as expected by
|
|
* the Security Manager Protocol.
|
|
*/
|
|
swap_digits((u64 *)tmp, (u64 *)public_key, 4); /* x */
|
|
swap_digits((u64 *)&tmp[32], (u64 *)&public_key[32], 4); /* y */
|
|
|
|
free_all:
|
|
kpp_request_free(req);
|
|
free_tmp:
|
|
kfree(tmp);
|
|
return err;
|
|
}
|
|
|
|
/* generate_ecdh_keys() - generate ecc key pair.
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp().
|
|
* @public_key: memory where the computed ecc public key will be saved.
|
|
*
|
|
* Return: zero on success; error code in case of error.
|
|
*/
|
|
int generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64])
|
|
{
|
|
int err;
|
|
|
|
err = set_ecdh_privkey(tfm, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
return generate_ecdh_public_key(tfm, public_key);
|
|
}
|